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Other Current Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Other Liabilities Disclosure [Abstract]    
Passenger and other taxes and fees payable $ 163 $ 125
Salaries, wages and benefits 107 107
Station obligations 73 69
Aircraft maintenance 43 76
Fuel liabilities 36 35
Leased aircraft return costs 22 1
Other current liabilities 41 48
Total other current liabilities $ 485 $ 461